| 摘要 |
<p>PURPOSE:To provide the titled apparatus carrying out the renewal of a washing liquid easily and properly, by detecting that the specific gravity of a tower bottom liquid reaches a predetermined value or more by a densitometer for monitoring the specific gravity of the tower bottom liquid attached to a scrubbing tower to operate a washing liquid renewing apparatus. CONSTITUTION:When the specific gravity of a tower bottom liquid 3 reaches a set value or more, a densitometer 22 transmits the detected value to a scrubbing liquid renewing apparatus 16 through a line 23 and the apparatus 16 performs the renewal operation of the tower bottom liquid 3 by the input signal therefrom. That is, a solenoid valve 20 is closed through a power line 19 and a solenoid valve 18 is opened through a power line 17 to carry out the discharge of the tower bottom liquid 3. In this case, a level gauge 14 detects such a state that the level of the tower bottom liquid 3 is lowered to a definite level through a signal line 15 to close the valve 18. At this time, a valve 20 is opened to supply a replenishing water 12 through a liquid level controller 19 to return the liquid amount of the tower bottom liquid 3 to the original amount. The tower bottom liquid 3 is diluted by this operation and NaClO (purifying chemical agent) is injected corresponding to the diluted position of said chemical agent by operating a concn. controller 8 to raise the concn. of the chemical agent to set concn. and the renewal operation of the tower bottom liquid 3 is completed.</p> |
